Dyscalculia is a specific learning disability that affects a
person's ability to acquire arithmetical skills. Research suggests
that dyscalculia has varying levels of severity and can affect
different areas of mathematics. There is a strong overlap with
dyslexia, with pure number processing difficulties (in the absence
of any other specific learning difficulties) appearing to be very
rare. Children with dyscalculia can struggle with day-to-day
activities such as dealing with finances, following directions,
managing a diary and keeping track of time.
Medical text written May 2012 by John Rack PhD, Head of
Research, Development and Policy, Dyslexia Action, UK.